<b>A Study of the Nitrate Ion Dissociation in Fused Nitrates</b>

Kust, Roger N.; Duke, Frederick R.

doi:10.1021/ja00904a004

Cited by 78 publications

(14 citation statements)

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“…The sodium nitrate sample adsorbed more CO 2 than the sodium nitrite sample, but on the potassium case, it was exactly the contrary. It is reported that alkali metal nitrites have the ability to accommodate higher concentrations of oxygen ions, facilitating the fast generation of CO 3 2– and, thus, enabling fast nucleation and growth of MgCO 3 . , In this case, the sodium nitrite sample reacted with the magnesium precursor to form Na 2 CO 3 with the solid state during the carbonation process, resulting in partial losses of the available molten nitrate promoters.…”

Section: Resultsmentioning

confidence: 99%

Study on MNO₃/NO₂ (M = Li, Na, and K)/MgO Composites for Intermediate-Temperature CO₂ Capture

et al. 2018

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Molten salt [MNO3/NO2 (M = Li, Na, and K)]-promoted MgO composite-type CO2 adsorbents with high capacity and cycling stability are fabricated by controlled hydrolysis along with an incipient impregnation approach. The remarkable results of molten salts on the CO2 capture performance of MgO adsorbents and the CO2 capture capacities with different loadings and calcination and adsorption temperatures were comprehensively investigated. Notably, optimized NaNO3-promoted MgO exhibited the highest CO2 capture capacity of 17.0 mmol g–1 at 350 °C and maintained excellent regenerability through multiple cycles. The initial CO2 uptakes of MNO3/NO2 (M = Li, Na, and K)/MgO composites follow the order of NaNO3 (17.0 mmol g–1) > LiNO3 (14.1 mmol g–1) > NaNO2 (12.5 mmol g–1) > KNO2 (9.3 mmol g–1) > KNO3 (5.0 mmol g–1). Furthermore, NaNO3 and KNO3 with good chemical stability are the effective constituents for the NaNO3 system and KNO3/KNO2-promoted system, respectively, and preserved their original form after the interaction with CO2. The NaNO2 system consists of NaNO3 and Na2CO3 to form double carbonates Na2Mg(CO3)2 after CO2 adsorption. The morphology and structure of the MgO skeleton and the introduction of promoters are essential factors for intermediate-temperature CO2 capture.

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Section: Resultsmentioning

confidence: 99%

Study on MNO₃/NO₂ (M = Li, Na, and K)/MgO Composites for Intermediate-Temperature CO₂ Capture

et al. 2018

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“…This area for specimen 19 was calculated from the results given in ref. 4 and found to be 0.077 cm.2. Knowing this area, eo was calculated from the slope of the lines in Figure 1.…”

Section: Resultsmentioning

confidence: 96%

Enhanced Oxidation of Platinum in Activated Oxygen. III. Kinetics and Mechanism

Fryburg¹

1965

J. Phys. Chem.

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NOTES drogen peroxide as measured a t 26, 37, and 54". Excellent agreement with the first-order assumption can be seen.The reaction rate constants are plotted 21s. 1/T in Figure 2; the activation energy for the process is 12.9 kcal./mole. Table I shows the activation energies obtained by other investigators for the decomposition of H202 on glass. 11, is of interest to note the divergence among the results, depending on the various treatments of the glass. The excellent agreement between our value and that of Giguhre for Pyrex glass indicates that the mechanism of the heterogeneous decomposition in both the liquid and the vapor phases is the same. This suggestion, based on other considerations, has been made by Roiter and Gaukman,* who compared the activities of several catalytic materials for the decomposition of hydrogen peroxide; they noted that the relative activities of the catalysts studied were about the same in the liquid as in the vapor phase.(4) V. I was increased by using a highly stabilized, solid-state d.c. power supply to heat the platinum specimen and by monitoring the resistance of the specimen with a fast-response digital voltmeter.The experimental procedure was similar to that employed in ref. 1 except that the arc was stabilized by running for 2 hr. before starting the oxidation run, and the 0-atom concentration was measured in the vicinity of the specimen before and after each run. The concentration of 0 atoms was varied for the different runs by varying the distance between the specimen and the discharge. No effect of flow rate of oxygen on the results could be observed. Results and DiscussionIt was shown previously (Figure 3 of ref. 1) that the oxidation of platinum by both 0 atoms and O2 molecules is linear with respect to time. The dependence of the rate of oxidation of a typical specimen (length, 2.9 cm. ; width, 0.0287 cm. ; thickness, 0.0025 cm. ; center section, 1.1 cm.) a t different temperatures on the partial pressure of 0 atoms is shown in Figure 1. The rates are total rates, including oxidation due to both 0 atoms and O2 molecules. The intercept on the ordinate is the rate due to 0 2 molecules alone a t the corresponding temperature. The data a t 900 and MechanismSome time ago we reported1 that the rate of oxidation of platinum a t 1000" was enhanced in activated oxygen. Recent experiments2 have confirmed that the enhancement most probably results from the reaction of the normal 3P 0 atom with the platinum and that the oxide formed is PtOz. Since the reaction is now defined, the present communication will discuss the kinetics and the mechanism. Experimental SectionThe oxidation experiments have been extended to other temperatures, and the apparatus has been modified to allow use of more modern methods of 0-atom production and detection. A microwave power supply with a slotted wave guide was used to activate the oxygen, and the concentration of 0 atoms in the oxygen was determined by the NO2 titration and NO-0 afterglow technique^.^ The precision of the results Gas: Oxygen -1 percen...

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“…The effect of the solvent nature on the mechanism and rate of chemical reactions in ionic melts was first discovered by Rust and Duke 31 in a study on acid-base equilibria in nitrate-containing melts. It was shown that replacement of a solvent with weakly polarising cations by a solvent with strongly polarising cations accelerates the reactions.…”

Section: Effect Of Cations On the Mechanisms Of Chemical And Electroc...mentioning

confidence: 99%

“…In fact, the nature of the electrode process preceding the electrochemical reduction of alkali metals, which has first been reported by Lyalikov and Karamzin, 30 was interpreted in different manners. Rust and Duke, 31 who studied acidbase equilibria, assumed that it is the dissociation product of the anion, viz., the nitronium ion NO 2 , that is reduced in electrochemical and chemical reactions. A similar conclusion was reached by Delimarskii et al 32 However, no direct measurements could prove the existence of NO 2 in nitrate melts.…”

Section: Introductionmentioning

confidence: 99%

Electrochemically active species and multielectron processes in ionic melts

Shapoval¹,

Solov'ev²,

Малышев³

2001

Russ. Chem. Rev.

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A Study of the Nitrate Ion Dissociation in Fused Nitrates

Cited by 78 publications

References 5 publications

Study on MNO₃/NO₂ (M = Li, Na, and K)/MgO Composites for Intermediate-Temperature CO₂ Capture

Study on MNO₃/NO₂ (M = Li, Na, and K)/MgO Composites for Intermediate-Temperature CO₂ Capture

Enhanced Oxidation of Platinum in Activated Oxygen. III. Kinetics and Mechanism

Electrochemically active species and multielectron processes in ionic melts

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A Study of the Nitrate Ion Dissociation in Fused Nitrates

Cited by 78 publications

References 5 publications

Study on MNO3/NO2 (M = Li, Na, and K)/MgO Composites for Intermediate-Temperature CO2 Capture

Study on MNO3/NO2 (M = Li, Na, and K)/MgO Composites for Intermediate-Temperature CO2 Capture

Enhanced Oxidation of Platinum in Activated Oxygen. III. Kinetics and Mechanism

Electrochemically active species and multielectron processes in ionic melts

Contact Info

Product

Resources

About

Study on MNO₃/NO₂ (M = Li, Na, and K)/MgO Composites for Intermediate-Temperature CO₂ Capture

Study on MNO₃/NO₂ (M = Li, Na, and K)/MgO Composites for Intermediate-Temperature CO₂ Capture